Why is Sen. Vitter holding up an Obama nominee?

You probably haven't heard of Beth Cobert. She's President Obama's nominee to head the Office of Personnel Management. But a vote in the U.S. Senate on her appointment to that office is currently being blocked by Sen. David Vitter (R-LA).

Why is he doing that? It has to do with Congress' special exemption from ObamaCare. My colleague Hadley Heath Manning explains on the most recent Health Care Minute from our Bridge to Better Health Care project: